------------[ cut here ]------------
workqueue: cannot queue hci_conn_timeout on wq hci0
WARNING: kernel/workqueue.c:2305 at __queue_work+0xd2d/0x12b0 kernel/workqueue.c:2304, CPU#3: syz.1.3027/12658
Modules linked in:
CPU: 3 UID: 0 PID: 12658 Comm: syz.1.3027 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xd31/0x12b0 kernel/workqueue.c:2304
Code: 00 00 00 fc ff df 49 8d 94 24 70 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 52 05 00 00 48 8d 3d 33 3a 56 0f 48 8b 75 18 <67> 48 0f b9 3a 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03
RSP: 0018:ffffc9000696fb40 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11006ad594b
RDX: ffff88802411f970 RSI: ffffffff8ab0dd90 RDI: ffffffff91258140
RBP: ffff8880356aca40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802411f800
R13: ffff888025c80000 R14: ffff8880356aca88 R15: ffff8880356aca48
FS:  00007f9a316ee6c0(0000) GS:ffff8880d60e7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 000000002aa40000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __queue_delayed_work+0x357/0x450 kernel/workqueue.c:2568
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2620
 queue_delayed_work include/linux/workqueue.h:714 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1710 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1684 [inline]
 hci_connect_sco+0x4d2/0xef0 net/bluetooth/hci_conn.c:1839
 sco_connect net/bluetooth/sco.c:347 [inline]
 sco_sock_connect+0x63a/0x1560 net/bluetooth/sco.c:715
 __sys_connect_file+0x141/0x1a0 net/socket.c:2135
 __sys_connect+0x141/0x170 net/socket.c:2154
 __do_sys_connect net/socket.c:2160 [inline]
 __se_sys_connect net/socket.c:2157 [inline]
 __x64_sys_connect+0x72/0xb0 net/socket.c:2157
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9a3079aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a316ee028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f9a30a15fa0 RCX: 00007f9a3079aeb9
RDX: 0000000000000008 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f9a30808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a30a16038 R14: 00007f9a30a15fa0 R15: 00007fffecdf1c88
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 fc                	add    %bh,%ah
   4:	ff                   	lcall  (bad)
   5:	df 49 8d             	fisttps -0x73(%rcx)
   8:	94                   	xchg   %eax,%esp
   9:	24 70                	and    $0x70,%al
   b:	01 00                	add    %eax,(%rax)
   d:	00 48 89             	add    %cl,-0x77(%rax)
  10:	f9                   	stc
  11:	48 c1 e9 03          	shr    $0x3,%rcx
  15:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  19:	0f 85 52 05 00 00    	jne    0x571
  1f:	48 8d 3d 33 3a 56 0f 	lea    0xf563a33(%rip),%rdi        # 0xf563a59
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  36:	fc ff df
  39:	48 89 ea             	mov    %rbp,%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx